\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Panel A: Monadic Dependent Variables}
\begin{tabular}{l*{4}{ccc}}
\toprule
                    &\multicolumn{3}{c}{(1)}               &\multicolumn{3}{c}{(2)}               &\multicolumn{3}{c}{(3)}               &\multicolumn{3}{c}{(4)}               \\
                    &\multicolumn{3}{c}{Full Sample}       &\multicolumn{3}{c}{Benchmark Sample}  &\multicolumn{3}{c}{panel\_a\_3}         &\multicolumn{3}{c}{panel\_a\_benchmark} \\
                    &        mean&          sd&       count&        mean&          sd&       count&        mean&          sd&       count&        mean&          sd&       count\\
\midrule
q4a                 &       5.044&       1.755&         472&            &            &            &            &            &            &            &            &            \\
q4b                 &       5.108&       1.958&         463&            &            &            &            &            &            &            &            &            \\
actual\_15           &            &            &            &       4.848&       1.816&         282&            &            &            &            &            &            \\
asso                &            &            &            &            &            &            &       0.595&       0.491&         543&       0.669&       0.471&         323\\
q4a                 &            &            &            &            &            &            &            &            &            &       5.102&       1.708&         323\\
q4b                 &            &            &            &            &            &            &            &            &            &       5.167&       1.920&         323\\
polposnow\_15\_i1     &            &            &            &            &            &            &            &            &            &       4.895&       1.710&         153\\
\midrule
Observations        &         483&            &            &         282&            &            &         543&            &            &         323&            &            \\
\bottomrule
\multicolumn{13}{l}{\footnotesize Statistics in (1) are computed on the full sample of data available for each variable,}\\
\multicolumn{13}{l}{\footnotesize while statistics in (2) are computed on the benchmark sample.}\\
\end{tabular}
\end{table}
